You can use the F test to verify a claim about a standard deviation (or variance) for 2 data sets.
NOTE: some professors prefer to use the following notation: N~(mean, Standard Deviation) ^{2 }) AND you are testing a claim about a standard deviation
or variance.
H H Critical Value = shaded area from F table using the degrees of freedom.
F = ^{ }**The bigger variance (standard deviation squared) must be divided by the smaller variance (standard deviation squared).**
Press STAT Highlight TESTS Select 2-SampFTest Put your information in. **NOTE: S Make sure the Highlight Calculate Press ENTER F is the test statistic, and P is the P-value.
You can reject the null hypothesis if: - the F from the formula falls in the shaded critical area from the table.
- the P-value is smaller than your alpha Reject Ho.
Remember: if you are not given an alpha assume you are using 0.05. |

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